noun.
The therapeutic use of water, either internal or external
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the internal and external use of water in the treatment of disease
Word Usage
"Meanwhile, the average townfolk turned to fixing themselves as well, trying everything from religion to vegetarianism to hydropathy—the last of which required cold water immersions, foot baths, douches, and the like."